IDA Help: define_local_var

Create a local variable
     start, end - range of addresses for the local variable.
                  For the stack variables the end address is ignored.
                  If there is no function at 'start' then this function.
                  will fail.
     location  -  the variable location in the "[bp+xx]" form where xx is
                  a number. The location can also be specified
                  as a register name.
     name      -  name of the local variable
returns: 1-ok, 0-failure

success define_local_var(long start, long end, string location, string name);